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EP1660769A1 - Split piston for an internal combustion engine - Google Patents

Split piston for an internal combustion engine

Info

Publication number
EP1660769A1
EP1660769A1 EP04762692A EP04762692A EP1660769A1 EP 1660769 A1 EP1660769 A1 EP 1660769A1 EP 04762692 A EP04762692 A EP 04762692A EP 04762692 A EP04762692 A EP 04762692A EP 1660769 A1 EP1660769 A1 EP 1660769A1
Authority
EP
European Patent Office
Prior art keywords
piston
intermediate sleeve
thread
external thread
connecting projection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04762692A
Other languages
German (de)
French (fr)
Other versions
EP1660769B1 (en
Inventor
Michael Ullrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle GmbH
Original Assignee
Mahle GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP1660769A1 publication Critical patent/EP1660769A1/en
Application granted granted Critical
Publication of EP1660769B1 publication Critical patent/EP1660769B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces

Definitions

  • the invention relates to a multi-part piston for an internal combustion engine according to the preamble of claim 1.
  • an intermediate sleeve is first screwed into an annular rib of the lower part of the piston, after which the entire upper part of the piston is screwed into the intermediate sleeve.
  • the intermediate sleeve acts here as an upsetting body, which generates a mechanical tension that serves to fix the screw connection.
  • FIG. 1 shows a sectional view of a two-part piston, the upper part of which is screwed to its lower part via an intermediate sleeve
  • Fig. 2 is a fragmentary, enlarged sectional view of the piston with the intermediate sleeve according to the invention.
  • a multi-part cooled piston 1 which consists of an upper part 2 and a lower part 3.
  • the upper part 2 and the lower part 3 are made of steel.
  • the piston head 4 is formed by the upper part 2, the inner area of which has a combustion bowl 5.
  • an annular wall 6 is formed, the outer surface of which forms the top land 7 on the piston crown side, which is followed by the ring portion 8 with annular grooves for receiving piston rings, not shown in the figure.
  • the inner support 9 is connected to the side of the upper part 2 facing away from the combustion bowl 5 arranged support surface 11 and formed by a piston bottom side on an annular support rib 12 of the lower part 3 arranged support surface 13.
  • the outer support 10 is formed by a support surface 14 delimiting the underside of the ring wall 6 and by a support surface 16 arranged on the piston bottom side on an annular support web 15 of the lower part 3.
  • a cooling channel 22 is formed in the edge area of the piston crown 4, the radially outer boundary of the annular wall 6, the radially inner boundary partly of the support rib 12 and partly of the piston crown 4, and its axially lower limit are formed by the lower part 3 of the piston 1.
  • Cooling oil not shown, is introduced into the cooling channel 22 and is discharged from the cooling channel 22.
  • the coaxial alignment of these two parts is achieved in that the supporting web 15 is of stepped design in section and the lower end face of the ring wall 6 has a cylindrical recess 23 on the inside, the inner shape of which corresponds to the outer shape of the supporting web 15 corresponds so that when mounting the upper and lower part 2, 3 of the piston 1, the supporting web 15 can be inserted into the recess 23 and thus the upper and lower part 2, 3 can be aligned coaxially.
  • the piston crown 4 On the side facing away from the combustion bowl 5, the piston crown 4 has a tubular connecting projection 24 which is arranged coaxially with the piston longitudinal axis 20 and the length of which does not exceed the distance from the piston crown 4 to the pin bosses 17, 17 '.
  • the outside of the end of the connecting projection 24 facing away from the piston crown 4 is provided with an external thread 25.
  • the inside of the support rib 12 near the piston crown 4 has an internal thread 26.
  • the radii of the support rib 12 and the connecting projection 24 are selected such that the radial diameter of the internal thread 26 of the supporting rib 12 is greater than the radial diameter of the external thread 25 of the connecting projection 24.
  • the axial distance between the external thread 25 and the pin bosses 17 , 17 ' less than the axial distance between the internal thread 26 and the pin boss 17, 17'.
  • a tubular intermediate sleeve 27 is required, the length of which corresponds to the difference between the distances of the external thread 25 and the internal thread 26 from the pin bosses 17, 17 ', and which has at least at its ends an inside 28 and an outside thread 29, the inside thread 28 fitting on the outside thread 25 of the connecting projection 24 and the outside thread 29 on the inside thread 26 of the support rib 12.
  • the fact that the intermediate sleeve 27 only comes into contact with the connecting projection 24 and the supporting rib 12 in the area of the threaded connections 25, 26, 28, 29 ensures that during the assembly of the upper and lower part 2, 3 of the piston 1, the connecting projection 24 expands and the intermediate sleeve 27 undergoes compression, by means of which deformations on the threaded connections between the upper and lower part 2, 3 of the piston 1 become a fixation mechanical tension serving these connections is exerted.
  • the wall thicknesses must be dimensioned accordingly so that the deformations of the connecting projection 24 and the intermediate sleeve 27 used to fix the threaded connections are sufficiently large.
  • the connecting projection 24 has a screw flange 30 with the external thread 25 at its end facing the pin bosses 17, 17 ', the internal thread 28 is arranged on the entire inside of the intermediate sleeve 27, and has that facing the piston crown 4 End of the intermediate sleeve 27 also a screw flange 31 with the external thread 29.
  • the connecting projection 24 has at its end facing away from the piston head 4 the screw flange 30, which is located on its radially outer peripheral surface the external thread 25 carries.
  • the intermediate sleeve 27 has on its entire, radially inner surface the thread 28 on which the external thread 25 of the screw flange 30 fits.
  • the intermediate sleeve 27 also has a screw flange 31 which, on its radially outer circumferential surface, carries the thread 29 which fits on the internal thread 26, which on a radially inner surface adjacent to the upper part 2 Support rib 12 is arranged.
  • the end face 32 of the intermediate sleeve 27 on the piston bottom side forms a common, flat contact surface for the upper part 2 of the piston 1 with the support surface 13 arranged on the support rib 12.
  • the piston 1 is assembled in a simple manner by first screwing the intermediate sleeve 27 into the annular rib 12 of the lower part 3 and then the upper part 2 of the piston 1 via the external thread 25 of the connecting piece 24 into the internal thread 28 of the intermediate sleeve 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

A split piston (1), for an internal combustion engine is disclosed, comprising an upper piece (2), connected to a lower piece (3), by means of a screw connection. The screw connection comprises a tubular connector piece (24), mounted on the underside of the piston upper piece (2) with an external thread (25), a spacer sleeve (27) with an external (29) and an internal (28) thread and a support rib (12) formed on the lower piece (3) of the piston (1) with an internal thread (26). The upper piece (2) can thus be screwed to the lower piece (3), by means of the connector piece (24), the spacer sleeve (27) and the support rib (12). The spacer sleeve (27) acts as a compressing body and the connector piece (24) as an extending body, to generate the mechanical tension necessary for fixing the screw connection.

Description

Mehrteiliger Kolben für einen Verbrennungsmotor Multi-part piston for an internal combustion engine
Die Erfindung betrifft einen mehrteiligen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1.The invention relates to a multi-part piston for an internal combustion engine according to the preamble of claim 1.
Aus der Deutschen Patentschrift 969 838 ist ein mehrteiliger Kolben für einen Verbrennungsmotor bekannt, der aus einem Kolbenhauptkörper und aus einem mittels Dehnschrauben damit verbundenen Bodenteil besteht. Um hierbei auch bei schnelleren Hin- und Herbewegungen des Kolbens eine sichere Schraubverbindung zu gewährleisten, sind zur Montage des Bodenteiles an den Kolbenhauptkörper eine größere Anzahl von Dehnschrauben erforderlich. Dies hat die Nachteile, dass die Montage des bekannten Kolbens sehr zeit- und arbeitsaufwendig ist.From German Patent 969 838 a multi-part piston for an internal combustion engine is known, which consists of a piston main body and a base part connected to it by means of expansion screws. In order to ensure a secure screw connection even with faster reciprocating movements of the piston, a larger number of expansion screws are required for mounting the base part on the piston main body. This has the disadvantages that the assembly of the known piston is very time-consuming and labor-intensive.
Diese Nachteile des Standes der Technik zu vermeiden, ist Aufgabe der Erfindung. Gelöst wird die Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The object of the invention is to avoid these disadvantages of the prior art. The task is solved with the characteristics of the main claim. Appropriate embodiments of the invention are the subject of the dependent claims.
Die Vorteile der schnellen, einfachen und sicheren Montage des erfindungsgemäßen Kolbens werden dadurch erreicht, dass hierbei zunächst eine Zwischenhülse in eine Ringrippe des Unterteiles des Kolbens eingeschraubt wird, wonach das gesamte Oberteil des Kolbens in die Zwischenhülse geschraubt wird. Die Zwischenhülse wirkt hierbei als Stauchkörper, der eine der Fixierung der Schraubverbindung dienende mechanische Spannung erzeugt.The advantages of the quick, simple and safe assembly of the piston according to the invention are achieved in that an intermediate sleeve is first screwed into an annular rib of the lower part of the piston, after which the entire upper part of the piston is screwed into the intermediate sleeve. The intermediate sleeve acts here as an upsetting body, which generates a mechanical tension that serves to fix the screw connection.
Die Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen Fig. 1 ein Schnittbild eines zweiteiligen Kolbens, dessen Oberteil mit dessem Unterteil über eine Zwischenhülse verschraubt ist, und Fig. 2 ein ausschnittsweises, vergrößertes Schnittbild des Kolbens mit der erfindungsgemäßen Zwischenhülse.The invention is described below with reference to the drawings. 1 shows a sectional view of a two-part piston, the upper part of which is screwed to its lower part via an intermediate sleeve, and Fig. 2 is a fragmentary, enlarged sectional view of the piston with the intermediate sleeve according to the invention.
In Fig. 1 ist ein mehrteiliger gekühlter Kolben 1 dargestellt, der aus einem Oberteil 2 und einem Unterteil 3 besteht. Das Oberteil 2 und das Unterteil 3 sind aus Stahl gefertigt. Vom Oberteil 2 wird der Kolbenboden 4 gebildet, dessen innerer Bereich eine Verbrennungsmulde 5 aufweist. An den Außenrand des Kolbenbodens 4 ist eine Ringwand 6 angeformt, deren Außenfläche kolbenbodenseitig den Feuersteg 7 bildet, woran sich die Ringpartie 8 mit Ringnuten zur Aufnahme von in der Figur nicht dargestellten Kolbenringen anschließt.In Fig. 1, a multi-part cooled piston 1 is shown, which consists of an upper part 2 and a lower part 3. The upper part 2 and the lower part 3 are made of steel. The piston head 4 is formed by the upper part 2, the inner area of which has a combustion bowl 5. On the outer edge of the piston crown 4, an annular wall 6 is formed, the outer surface of which forms the top land 7 on the piston crown side, which is followed by the ring portion 8 with annular grooves for receiving piston rings, not shown in the figure.
An der dem Kolbenboden 4 abgewandten Seite des Unterteils 3 sind zwei Bolzennaben 17, 17' mit je einer Bolzenbohrung 18, 18' angeordnet, deren Stirnseiten 19, 19' gegenüber der Ringwand 6 in Richtung Kolbenlängsachse 20 zurückgesetzt angeordnet sind. Mit den Bolzennaben 17, 17' und dem Unterteil 3 des Kolbens 1 sind Kolbenschaftelemente 21 verbunden.On the side of the lower part 3 facing away from the piston crown 4, two pin bosses 17, 17 'are arranged, each with a pin bore 18, 18', the end faces 19, 19 'of which are set back in relation to the ring wall 6 in the direction of the longitudinal axis 20 of the piston. Piston shaft elements 21 are connected to the pin bosses 17, 17 'and the lower part 3 of the piston 1.
Miteinander verbunden sind das Oberteil 2 und das Unterteil 3 des Kolbens 1 zum einen über eine innere Auflage 9 und zum anderen über eine konzentrisch dazu angeordnete, äußere Auflage 10. Die innere Auflage 9 wird von einer auf der der Verbrennungsmulde 5 abgewandten Seite des Oberteils 2 angeordneten Auflagefläche 11 und von einer kolbenbodenseitig auf einer ringförmigen Tragrippe 12 des Unterteils 3 angeordneten Auflagefläche 13 gebildet. Die äußere Auflage 10 wird von einer die Unterseite der Ringwand 6 begrenzenden Auflagefläche 14 und von einer kolbenbodenseitig auf einem ringförmigen Tragsteg 15 des Unterteils 3 angeordneten Auflagefläche 16 gebildet.Connected to one another are the upper part 2 and the lower part 3 of the piston 1, on the one hand via an inner support 9 and on the other hand via an outer support 10 arranged concentrically therewith. The inner support 9 is connected to the side of the upper part 2 facing away from the combustion bowl 5 arranged support surface 11 and formed by a piston bottom side on an annular support rib 12 of the lower part 3 arranged support surface 13. The outer support 10 is formed by a support surface 14 delimiting the underside of the ring wall 6 and by a support surface 16 arranged on the piston bottom side on an annular support web 15 of the lower part 3.
Vom Oberteil 2 und vom Unterteil 3 des Kolbens 1 wird ein im Randbereich des Kolbenbodens 4 angeordneter Kühlkanal 22 gebildet, dessen radial äußere Begrenzung von der Ringwand 6, dessen radial innere Begrenzung teils von der Tragrippe 12 und teils vom die Verbrennungsmulde 5 begrenzenden Kolbenboden 4, und dessen axial untere Begrenzung vom Unterteil 3 des Kolbens 1 gebildet werden. Über in der Figur nicht dargestellte Ein- und Auslassöffnungen wird Kühlöl in den Kühlkanal 22 eingeleitet und aus dem Kühlkanal 22 abgeleitet.From the upper part 2 and from the lower part 3 of the piston 1, a cooling channel 22 is formed in the edge area of the piston crown 4, the radially outer boundary of the annular wall 6, the radially inner boundary partly of the support rib 12 and partly of the piston crown 4, and its axially lower limit are formed by the lower part 3 of the piston 1. About in the figure Cooling oil, not shown, is introduced into the cooling channel 22 and is discharged from the cooling channel 22.
Beim Zusammenbau von Oberteil 2 und Unterteil 3 wird die koaxiale Ausrichtung dieser beiden Teile dadurch erreicht, dass der Tragsteg 15 im Schnitt stufenförmig ausgebildet ist und die untere Stirnseite der Ringwand 6 auf der Innenseite eine zylinderförmige Ausnehmung 23 aufweist, deren Innenform der Außenform des Tragsteges 15 entspricht, sodass bei der Montage von Ober- und Unterteil 2, 3 des Kolbens 1 der Tragsteg 15 in die Ausnehmung 23 einführbar und damit Ober- und Unterteil 2, 3 koaxial ausrichtbar sind.When the upper part 2 and lower part 3 are assembled, the coaxial alignment of these two parts is achieved in that the supporting web 15 is of stepped design in section and the lower end face of the ring wall 6 has a cylindrical recess 23 on the inside, the inner shape of which corresponds to the outer shape of the supporting web 15 corresponds so that when mounting the upper and lower part 2, 3 of the piston 1, the supporting web 15 can be inserted into the recess 23 and thus the upper and lower part 2, 3 can be aligned coaxially.
Auf der der Verbrennungsmulde 5 abgewandten Seite weist der Kolbenboden 4 einen zur Kolbenlängsachse 20 koaxial angeordneten, rohrformigen Verbindungsansatz 24 auf, dessen Länge den Abstand vom Kolbenboden 4 bis zu den Bolzennaben 17, 17' nicht übersteigt. Die Außenseite des dem Kolbenboden 4 abgewandten Endes des Verbindungsansatzes 24 ist mit einem Außengewinde 25 versehen. Zudem weist die Innenseite der Tragrippe 12 nahe dem Kolbenboden 4 ein Innengewinde 26 auf. Hierbei sind die Radii der Tragrippe 12 und des Verbindungsansatzes 24 so gewählt, dass der radiale Durchmesser des Innengewindes 26 der Tragrippe 12 größer ist als der radiale Durchmesser des Außengewindes 25 des Verbindungsansatzes 24. Zudem ist der axiale Abstand zwischen dem Außengewinde 25 und den Bolzennaben 17, 17' geringer als der axiale Abstand zwischen dem Innengewinde 26 und den Bolzennaben 17, 17'.On the side facing away from the combustion bowl 5, the piston crown 4 has a tubular connecting projection 24 which is arranged coaxially with the piston longitudinal axis 20 and the length of which does not exceed the distance from the piston crown 4 to the pin bosses 17, 17 '. The outside of the end of the connecting projection 24 facing away from the piston crown 4 is provided with an external thread 25. In addition, the inside of the support rib 12 near the piston crown 4 has an internal thread 26. Here, the radii of the support rib 12 and the connecting projection 24 are selected such that the radial diameter of the internal thread 26 of the supporting rib 12 is greater than the radial diameter of the external thread 25 of the connecting projection 24. In addition, the axial distance between the external thread 25 and the pin bosses 17 , 17 'less than the axial distance between the internal thread 26 and the pin boss 17, 17'.
Um das Oberteil 2 und das Unterteil 3 über die beiden Gewinde 25 und 26 miteinander zu verschrauben, ist somit eine rohrförmige Zwischenhülse 27 erforderlich, deren Länge der Differenz der Abstände des Außengewindes 25 und des Innengewindes 26 von den Bolzennaben 17, 17' entspricht, und die zumindest an ihren Enden ein innen 28 und ein außen liegendes Gewinde 29 aufweist, wobei das innen liegende Gewinde 28 auf das Außengewinde 25 des Verbindungsansatzes 24 und das außen liegende Gewinde 29 auf das Innengewinde 26 der Tragrippe 12 passen. Dadurch, dass die Zwischenhülse 27 nur im Bereich der Gewindeverbindungen 25, 26, 28, 29 in Kontakt mit dem Verbindungsansatz 24 und der Tragrippe 12 kommt, ist gewähr- leistet, dass bei der Montage von Ober- und Unterteil 2, 3 des Kolbens 1 der Verbindungsansatz 24 eine Dehnung und die Zwischenhülse 27 eine Stauchung erfahren, durch welche Verformungen auf die Gewindeverbindungen zwischen Ober- und Unterteil 2, 3 des Kolbens 1 eine der Fixierung dieser Verbindungen dienende mechanische Spannung ausgeübt wird. Damit die der Fixierung der Gewindeverbindungen dienenden Verformungen des Verbindungsansatzes 24 und der Zwischenhülse 27 ausreichend groß sind, sind deren Wandstärken demgemäß zu dimensionieren.In order to screw the upper part 2 and the lower part 3 together via the two threads 25 and 26, a tubular intermediate sleeve 27 is required, the length of which corresponds to the difference between the distances of the external thread 25 and the internal thread 26 from the pin bosses 17, 17 ', and which has at least at its ends an inside 28 and an outside thread 29, the inside thread 28 fitting on the outside thread 25 of the connecting projection 24 and the outside thread 29 on the inside thread 26 of the support rib 12. The fact that the intermediate sleeve 27 only comes into contact with the connecting projection 24 and the supporting rib 12 in the area of the threaded connections 25, 26, 28, 29 ensures that during the assembly of the upper and lower part 2, 3 of the piston 1, the connecting projection 24 expands and the intermediate sleeve 27 undergoes compression, by means of which deformations on the threaded connections between the upper and lower part 2, 3 of the piston 1 become a fixation mechanical tension serving these connections is exerted. The wall thicknesses must be dimensioned accordingly so that the deformations of the connecting projection 24 and the intermediate sleeve 27 used to fix the threaded connections are sufficiently large.
Im Ausführungsbeispiel gemäß der Figur weist der Verbindungsansatz 24 an seinem den Bolzennaben 17, 17' zugewandten Ende einen Schraubflansch 30 mit dem Außengewinde 25 auf, ist das innen liegende Gewinde 28 auf der gesamten Innenseite der Zwischenhülse 27 angeordnet, und weist das dem Kolbenboden 4 zugewandte Ende der Zwischenhülse 27 ebenfalls einen Schraubflansch 31 mit dem außen liegenden Gewinde 29 auf. Hierdurch sind die oben beschriebenden und für die Verformung der Zwischenhülse 27 und des Verbindungsansatzes 24 erforderlichen Bedingungen erfüllt.In the exemplary embodiment according to the figure, the connecting projection 24 has a screw flange 30 with the external thread 25 at its end facing the pin bosses 17, 17 ', the internal thread 28 is arranged on the entire inside of the intermediate sleeve 27, and has that facing the piston crown 4 End of the intermediate sleeve 27 also a screw flange 31 with the external thread 29. As a result, the conditions described above and required for the deformation of the intermediate sleeve 27 and the connecting projection 24 are met.
Fig. 2 zeigt in vergrößerter Darstellung die über die Zwischenhülse 27 erfolgende Schraubverbindung zwischen dem Oberteil 2 und dem Unterteil 3 des Kolbens 1. Hierzu weist der Verbindungsansatz 24 an seinem dem Kolbenboden 4 abgewandten Ende den Schraubflansch 30 auf, der auf seiner radial außen liegenden Umfangsfläche das Außengewinde 25 trägt. Die Zwischenhülse 27 weist auf ihrer gesamten, radial innen liegenden Fläche das Gewinde 28 auf, auf das das Außengewinde 25 des Schraubflansches 30 passt. Auf ihrem dem Kolbenboden 4 zugewandten Ende weist die Zwischenhülse 27 ebenfalls einen Schraubflansch 31 auf, der auf seiner radial außen liegenden Umfangsfläche das Gewinde 29 trägt, das auf das Innengewinde 26 passt, welches auf einer radial innen liegenden und an das Oberteil 2 grenzenden Fläche der Tragrippe 12 angeordnet ist. Hierbei bildet die kol- benbodenseitige Stirnfläche 32 der Zwischenhülse 27 mit der auf der Tragrippe 12 angeordneten Auflagefläche 13 eine gemeinsame, ebene Auflagefläche für das Oberteil 2 des Kolbens 1. Die Montage des Kolbens 1 erfolgt auf einfache Weise dadurch, dass zunächst die Zwischenhülse 27 in die Ringrippe 12 des Unterteils 3 und anschließend das Oberteil 2 des Kolbens 1 über das Außengewinde 25 des Verbindungsstückes 24 in das innen liegende Gewinde 28 der Zwischenhülse 27 eingeschraubt werden. Beim Zusammenschrauben des Oberteiles 2 und des Unterteiles 3 kommt zunächst die untere Auflagefläche 11 des Oberteiles 2 in Kontakt mit der von der Tragrippe 12 und der Zwischenhülse 27 gebildeten Auflagefläche 13, 32, wonach ein weiteres Festdrehen des Oberteiles 2 auf dem Unterteil 3 bewirkt, dass der Verbindungsansatz 24 eine Dehnung in Richtung des Pfeiles 33 und die Zwischenhülse 27 eine Stauchung in Richtung des Pfeiles 34 erfahren. Durch diese Verformungen wird insb. auf die Gewindeverbindung 25, 28 zwischen dem Verbindungsansatzes 24 und der Zwischenhülse 27 eine mechanische Spannung ausgeübt, die erheblich zur Fixierung dieser Gewindeverbindung 25, 28 beiträgt. 2 shows an enlarged view of the screw connection between the upper part 2 and the lower part 3 of the piston 1 via the intermediate sleeve 27. For this purpose, the connecting projection 24 has at its end facing away from the piston head 4 the screw flange 30, which is located on its radially outer peripheral surface the external thread 25 carries. The intermediate sleeve 27 has on its entire, radially inner surface the thread 28 on which the external thread 25 of the screw flange 30 fits. On its end facing the piston crown 4, the intermediate sleeve 27 also has a screw flange 31 which, on its radially outer circumferential surface, carries the thread 29 which fits on the internal thread 26, which on a radially inner surface adjacent to the upper part 2 Support rib 12 is arranged. In this case, the end face 32 of the intermediate sleeve 27 on the piston bottom side forms a common, flat contact surface for the upper part 2 of the piston 1 with the support surface 13 arranged on the support rib 12. The piston 1 is assembled in a simple manner by first screwing the intermediate sleeve 27 into the annular rib 12 of the lower part 3 and then the upper part 2 of the piston 1 via the external thread 25 of the connecting piece 24 into the internal thread 28 of the intermediate sleeve 27. When the upper part 2 and the lower part 3 are screwed together, the lower bearing surface 11 of the upper part 2 first comes into contact with the bearing surface 13, 32 formed by the support rib 12 and the intermediate sleeve 27, after which further tightening of the upper part 2 on the lower part 3 causes that the connection projection 24 experiences an expansion in the direction of the arrow 33 and the intermediate sleeve 27 a compression in the direction of the arrow 34. As a result of these deformations, a mechanical tension is exerted, in particular on the threaded connection 25, 28 between the connecting projection 24 and the intermediate sleeve 27, which contributes considerably to fixing this threaded connection 25, 28.
BezuαszeichenlisteLIST OF REFERENCE NUMERALS
1 Kolben1 piston
2 Oberteil des Kolbens 12 upper part of the piston 1
3 Unterteil des Kolbens 13 lower part of the piston 1
4 Kolbenboden4 piston crown
5 Verbrennungsmulde5 combustion bowl
6 Ringwand6 ring wall
7 Feuersteg7 top land
8 Ringpartie8 ring section
9 innere Auflage9 inner edition
10 äußere Auflage10 outer edition
11 Auflagefläche11 contact surface
12 Tragrippe12 support rib
13, 14 Auflagefläche13, 14 contact surface
15 Tragsteg15 supporting bridge
16 Auflagefläche16 contact surface
17, 17' Bolzennabe17, 17 'pin hub
18, 18' Bolzenbohrung18, 18 'bolt hole
19, 19' Stirnseiten der Bolzenbohrungen 18, 18' 0 Kolbenlängsachse 1 Kolbenschaftelement 2 Kühlkanal 3 Ausnehmung 4 Verbindungsansatz 5 Außengewinde 6 Innengewinde 7 Zwischenhülse 8, 29 Gewinde der Zwischenhülse 2719, 19 'end faces of the pin bores 18, 18' 0 piston longitudinal axis 1 piston shaft element 2 cooling channel 3 recess 4 connecting projection 5 external thread 6 internal thread 7 intermediate sleeve 8, 29 thread of the intermediate sleeve 27
30, 31 Schraubflansch30, 31 screw flange
32 Stirnfläche der Zwischenhülse 2732 end face of the intermediate sleeve 27
33, 34 Pfeil 33, 34 arrow

Claims

Patentansprüche claims
1. Mehrteiliger Kolben (1 ) für einen Verbrennungsmotor - mit einem einen Kolbenboden (4) aufweisenden Oberteil (2), an dem eine Ringwand (6) mit einer Ringpartie (8) angeformt ist, und - mit einem Unterteil (3), das über eine Schraubverbindung (12, 24-31) mit dem Oberteil (2) verbunden ist und auf seiner dem Oberteil (2) abgewandten Unterseite Bolzennaben (17, 17') mit Bolzenbohrungen (18, 18') und mit den Bolzennaben (17, 17') verbundene Kolbenschaftelemente (21 ) aufweist, dadurch gekennzeichnet, dass die Schraubverbindung aus folgenden Elementen besteht: - aus einem auf der Unterseite des Kolbenbodens (4) angebrachten, im Wesentlichen rohrformigen Verbindungsansatz (24), der koaxial zur Kolbenlängsachse (20) angeordnet ist und an seinem in axialer Richtung vom Kolbenboden (4) wegweisenden Ende ein Außengewinde (25) aufweist, das auf einer radial außen liegenden Umfangsseite des Verbindungsansatzes (24) angeordnet ist, - aus einer kolbenbodenseitig am Unterteil (3) angeformten Tragrippe (12), die in axialer Richtung betrachtet an ihrem kolbenbodenseitigen Ende ein Innengewinde (26) aufweist, das auf einer radial innen liegenden Fläche angeordnet ist, und - aus einer im Wesentlichen rohrformigen Zwischenhülse (27) mit einem innen liegenden (28) und einem außen liegenden (29) Gewinde, mittels der das Oberteil (2) mit dem Unterteils (3) über den Verbindungsansatz (24) und über die Tragrippe (12) verschraubbar ist, und die derart ausgebildet ist, dass hierbei der Verbindungsansatz (24) dehnbar und die Zwischenhülse (27) stauchbar sind.1. Multi-part piston (1) for an internal combustion engine - with a piston crown (4) having an upper part (2) on which an annular wall (6) with an annular part (8) is formed, and - with a lower part (3) that is connected via a screw connection (12, 24-31) to the upper part (2) and on its underside facing away from the upper part (2), pin hubs (17, 17 ') with pin bores (18, 18') and with the pin hubs (17, 17 ') has connected piston skirt elements (21), characterized in that the screw connection consists of the following elements: - an essentially tubular connecting projection (24), which is arranged on the underside of the piston head (4) and is arranged coaxially to the piston longitudinal axis (20) and at its end pointing axially away from the piston crown (4) has an external thread (25) which is arranged on a radially outer circumferential side of the connecting projection (24), - molded from a piston crown on the lower part (3) Support rib (12), which, viewed in the axial direction, has an internal thread (26) on its piston-base-side end, which is arranged on a radially inner surface, and - from an essentially tubular intermediate sleeve (27) with an inner one (28) and an external (29) thread, by means of which the upper part (2) can be screwed to the lower part (3) via the connecting attachment (24) and via the supporting rib (12), and which is designed such that the connecting attachment (24) stretchable and the intermediate sleeve (27) are compressible.
2. Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass das außen liegende Gewinde (29) auf einer radial außen liegenden Umfangsfläche am kolbenbodenseitigen Ende der Zwischenhülse (27) angeordnet ist und in das Innengewinde (26) der Tragrippe (12) passt, und dass das innen liegende Gewinde (28) auf einer radial innen liegenden Fläche der Zwischenhülse (27) angeordneten ist und auf das Außengewinde (25) des Verbindungsansatzes (24) passt.2. Piston according to claim 1, characterized in that the external thread (29) is arranged on a radially outer peripheral surface on the piston bottom end of the intermediate sleeve (27) and fits into the internal thread (26) of the support rib (12), and that the inside thread (28) is arranged on a radially inner surface of the intermediate sleeve (27) and fits on the external thread (25) of the connecting projection (24).
3. Kolben nach Anspruch 2, dadurch gekennzeichnet, dass der axiale Abstand zwischen dem Innengewinde (26) der Tragrippe (12) und dem Kolbenboden (4) geringer ist als der axiale Abstand zwischen dem Außengewinde (25) des Verbindungsansatzes (24) und dem Kolbenboden (4), und dass der radiale Durchmesser des Innengewindes (26) größer ist als der radiale Durchmesser des Außengewindes (25).3. Piston according to claim 2, characterized in that the axial distance between the internal thread (26) of the support rib (12) and the piston head (4) is less than the axial distance between the external thread (25) of the connecting projection (24) and the Piston base (4), and that the radial diameter of the internal thread (26) is larger than the radial diameter of the external thread (25).
4. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wanddicken des Verbindungsansatzes (24) und der Zwischenhülse (27) derart dimensioniert sind, dass beim Verschrauben des Oberteils (2) mit dem Unterteil (3) über den Verbindungsansatz (24) und über die Zwischenhülse (27) der Verbindungsansatz (24) insoweit dehnbar und die Zwischenhülse (27) insoweit stauchbar sind, dass hierdurch eine der Fixierung der Schraubverbindung (12, 24-31) dienende mechanische Spannung erzeugbar ist.4. Piston according to one of the preceding claims, characterized in that the wall thicknesses of the connecting lug (24) and the intermediate sleeve (27) are dimensioned such that when the upper part (2) is screwed to the lower part (3) via the connecting lug (24) and via the intermediate sleeve (27) the connecting projection (24) is extensible and the intermediate sleeve (27) is compressible to the extent that a mechanical tension serving to fix the screw connection (12, 24-31) can be generated.
5. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Verbindungsansatz (24) an seinem dem Kolbenboden (4) abgewandten Ende einen Schraubflansch (30) mit dem Außengewinde (25) aufweist, dass das innen liegende Gewinde (28) auf der gesamten Innenseite der Zwischenhülse (27) angeordnet ist, und dass die Zwischenhülse (27) an ihrem dem Kolbenboden (4) zugewandten Ende einen Schraubflansch (31 ) mit dem außen liegenden Gewinde (29) aufweist. 5. Piston according to one of the preceding claims, characterized in that the connecting projection (24) on its end facing away from the piston head (4) has a screw flange (30) with the external thread (25) that the internal thread (28) on the The entire inside of the intermediate sleeve (27) is arranged, and that the intermediate sleeve (27) has a screw flange (31) with the external thread (29) at its end facing the piston head (4).
EP04762692A 2003-08-19 2004-08-19 Split piston for an internal combustion engine Expired - Lifetime EP1660769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10337961A DE10337961A1 (en) 2003-08-19 2003-08-19 Multi-part piston for an internal combustion engine
PCT/DE2004/001852 WO2005019631A1 (en) 2003-08-19 2004-08-19 Split piston for an internal combustion engine

Publications (2)

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EP1660769A1 true EP1660769A1 (en) 2006-05-31
EP1660769B1 EP1660769B1 (en) 2009-04-22

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EP (1) EP1660769B1 (en)
JP (1) JP4426578B2 (en)
KR (1) KR101153143B1 (en)
CN (1) CN100582464C (en)
BR (1) BRPI0413689A (en)
DE (2) DE10337961A1 (en)
WO (1) WO2005019631A1 (en)

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EP1960653B1 (en) * 2005-12-17 2010-12-01 Mahle International GmbH Two-piece piston for an internal combustion engine
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DE102007060472A1 (en) * 2007-12-14 2009-06-18 Mahle International Gmbh Two-piece piston for an internal combustion engine
DE102007061601A1 (en) * 2007-12-20 2009-06-25 Mahle International Gmbh Piston for an internal combustion engine and method for its production
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FR2960263B1 (en) * 2010-05-19 2015-08-07 Mce E Dev ELASTIC FASTENING FOR VARIABLE COMPRESSION RATE MOTOR PISTON
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Also Published As

Publication number Publication date
WO2005019631A1 (en) 2005-03-03
US7311075B2 (en) 2007-12-25
DE10337961A1 (en) 2005-04-21
JP4426578B2 (en) 2010-03-03
EP1660769B1 (en) 2009-04-22
KR20060066100A (en) 2006-06-15
US20060225568A1 (en) 2006-10-12
JP2007502927A (en) 2007-02-15
KR101153143B1 (en) 2012-06-04
CN100582464C (en) 2010-01-20
CN1839254A (en) 2006-09-27
HK1091530A1 (en) 2007-01-19
BRPI0413689A (en) 2006-10-24
DE502004009393D1 (en) 2009-06-04

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